Spit-balling: how about __filepath__ as a lazily-created-on-first-access pathlib.Path(__file__)?
Promoting os.path stuff to builtins just as pathlib is emerging as TOOWTDI makes me a bit uncomfortable.
On Sun, May 6, 2018 at 8:29 PM, Nick Coghlan ncoghlan@gmail.com wrote:
On 7 May 2018 at 12:35, Chris Angelico rosuav@gmail.com wrote:
On Mon, May 7, 2018 at 12:13 PM, Nick Coghlan ncoghlan@gmail.com wrote:
So I have a different suggestion: perhaps it might make sense to propose promoting a key handful of path manipulation operations to the status of being builtins?
Specifically, the ones I'd have in mind would be:
- dirname (aka os.path.dirname)
- joinpath (aka os.path.join)
These two are the basics of path manipulation. +1 for promoting to builtins, unless pathlib becomes core (which I suspect isn't happening).
pathlib has too many dependencies to ever make the type available as a builtin:
$ ./python -X importtime -c pass 2>&1 | wc -l 25 $ ./python -X importtime -c "import pathlib" 2>&1 | wc -l 53It's a good way of unifying otherwise scattered standard library APIs, but it's overkill if all you want to do is to calculate and resolve some relative paths.
- abspath (aka os.path.abspath)
Only +0.5 on this, as it has to do file system operations. It may be worthwhile, instead, to promote os.path.normpath, which (like the others) is purely processing the string form of the path. It'll return the same value regardless of the file system.
My rationale for suggesting abspath() over any of its component parts is based on a few key considerations:
- "make the given path absolute" is a far more common path manipulation
activitity than "normalise the given path" (most users wouldn't even know what the latter means - the only reason *I* know what it means is because I looked up the docs for abspath while writing my previous comment)
- __file__ isn't always absolute (especially in __main__), so you need to be
able to do abspath(__file__) in order to reliably apply dirname() more than once
- it can stand in for both os.getcwd() (when applied to the empty string or
os.curdir) and os.path.normpath() (when the given path is already absolute), so we get 3 new bits of builtin functionality for the price of one new builtin name
- I don't want to read "normpath(joinpath(getcwd(), relpath))" when I could
be reading "abspath(relpath)" instead
Cheers, Nick.
-- Nick Coghlan | ncoghlan@gmail.com | Brisbane, Australia
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